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YT / ESM Hurricane - Laser 200 in-line twin


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I am with paul on the firewall situation. All 3 of mine have been utterly hopeless with my P39 having 1/4 inch gaps between the wood and the glass. Not good ? 

 

I first noticed it on my la7 when i propped up the finished model on its nose for a photo. 20 seconds later there was a tearing sound and the model slumped a little. Inspection showed the plate had completely let go 

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I was going to PM you Ron but i might as well leave this here. 

 

I fired up the Hurricane's 200i just now in preparation for sending it. I wanted to try the new dumpy exhausts from the FT series engines on it and try it with a fuel line T piece and the new Optiful laser 5 pro. 

 

So, i fired it up using a small ish 17x8 apc prop and after a short time to warm up gave it the big one. And what a big one it was. Peak of 9100rpm which was way above my expectation of 8500-8600. Once hot the rpm fell away to about 8900 and held there which is perfectly fine. Performance was excellent with the T in the fuel line and once adjusted for the new fuel i saw an idle as low as 1000rpm, although 1500 is a more realistic low for reliability and 1800 recommended as a flight idle. The small exhausts were no bother either and the thing sounded awesome. 

 

I will get it packed up and out the door asap.

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1 minute ago, Ron Gray said:

Sorry Jon, I was out flying!

 

Whoopee! but don't tell anyone otherwise they'll all want one!

 

 

Well, it ran so nicely i almost tucked it under my arm and went home. Lucky for you it was too hot to handle at the time ? 

 

As for everyone else, i have the components for another 14 of them prepped and ready so i hope i can start dishing them out soon. I just need a few more parts, and to clear some other jobs. I will likely build them in pairs to preserve my sanity as much as possible. 

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  • 2 months later...

The 17th September (OW Scale weekend) is rapidly approaching and the Hurri has been sitting on the workbench with no work having been done on it since I rubbed the fuse down. So, despite the heat, I decided to make a start on the fitting of the new bulkhead to take the Laser 200i. As with the ESM Mustang (Laser 160i) the front of the fuse needed to be removed and the new bulkhead located about 80mm further back. Now this presented an issue, unlike the Mustang the Hurricane has quite a sharp taper on the nose which meant that if I just cut off the existing bulkhead I couldn't then just slot the new one in further back as it has to be larger than the hole left by the old one (the taper on the fuse). Plus I wanted to keep as much of the exiting nose in front of the new bulkhead in place to allow for the glassing overlap to give it strength as you can't easily get behind it to glass from the back. With me so far?? So this is what I've done.

 

Existing bulkhead cut off with panel saw

 

IMG_7100.thumb.jpeg.c6d7da5d8c717a855b4062c2599521ef.jpeg

 

I then cut back the top half of the fuse so that the new bulkhead can slide down from the top

 

IMG_7099.thumb.jpeg.4c40bd3b818a73c3a96a973106089877.jpeg

 

The new bulkhead (12mm ply) will sit in front of the one you can see in the last photo by 13mm so to give more strength to the top half where I've cut the fuse back I cut a backing former

 

IMG_7101.thumb.jpeg.1685c82d5d6c2f903790728f7a1dfe5b.jpeg

 

Which was then epoxied to the fuse and to the existing former (fuse is inverted in the next shot)

 

IMG_7102.thumb.jpeg.f39e944b3a21eb8120c593a2aca0347e.jpeg

 

I will be gluing in some backing blocks for the bottom half of the new bulkhead to make it easier to position it in the correct position, that will be tomorrow's job.

Edited by Ron Gray
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Well the Covid infection is gradually leaving me after nearly a week so I was able to spend 10 minutes here and there (resting in between!!) and have made some progress.

 

The new engine bulkhead was epoxied in place using the threaded rod method to locate it correctly in relation to the spinner ring.

 

IMG_7107.thumb.jpeg.b3bd510febf10ee4a9861c801914d8a1.jpeg

 

Once that had set I was then able to glass the front lower half from the front and the top upper half from the back. The large holes on the right are to allow the hot air to exit from the engine compartment.

 

IMG_7108.thumb.jpeg.d9aeda63d6402605686fce7453cf0aca.jpeg

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Still can't spend too long working on things as COVID tiredness kicks in, but I'm getting more time as each day passes the annoying thing is that Sara now has it and is confined to bed and I'm a useless nurse!

 

Anyway, some progress.

 

Tank recess cut in top of wing and opening lined and glassed

 

IMG_7117.thumb.jpeg.e211fedb8a43d3e613ec28652019c0b9.jpeg

 

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Tank support bracket 3D printed

 

IMG_7119.thumb.jpeg.ea484d8b3dc31a57441cfec2bde47282.jpeg

 

Engine does look nice in the nose

 

IMG_7121.thumb.jpeg.8a6449ffbc0a860cc872706d64f915f8.jpeg

 

IMG_7122.thumb.jpeg.e1f81fb44a88ce197d3614405890377a.jpeg

 

But it looks like I will have to convert it to the tropical one to hide the front pot (balsa on the exhaust port is where I cut off the previously fitted (hideous) ones, which will be replaced with 3D printed ones)

 

IMG_7120.thumb.jpeg.4bb684a2650312d04074a8a2c529bf47.jpeg

 

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Time to tackle the cowl! The previous owner has cut quite a large hole on the underside as he needed clearance for the gas engine he had installed so this needed filling prior to cutting out for the front pot of the 200i. I have been in correspondence with a US company who have some cowls in stock but thought that I’d do some work on my one whilst waiting for a price for the US one. Having searched through my workshop I couldn’t find any pieces of plastic that could be used as a temporary former to support the glassing so I used strips of old 1/32 sheet balsa instead.

 

E6238D30-8C93-4358-9F2F-F03F191691EC.thumb.jpeg.593f73d95126a7df82c31f069be49d5d.jpeg

 

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The inside was then glassed 

 

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Leaving this on the outside which will be sanded down

 

9C211CBC-6DD2-42D7-8F78-8A189D688FB0.thumb.jpeg.da3508bfad699394295010ffba525b5f.jpeg

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I thought that I’d better make a start on the canopy. A couple of months ago I ordered one for an 88” Hurricane from Sarik which, after much chopping, fits quite well. So I added some aluminium tape for the canopy frame 


BB06C35D-4F57-42E5-9135-2E386F558A84.thumb.jpeg.34d44027e429dfc645668432b5b4b24c.jpeg

 

Then formed the screw heads and masked it all up in readiness for paint.

 

D56C1425-8CA1-4A87-94E7-BD628369A280.thumb.jpeg.69321db5c064f23c5a0cd8e372e71ca2.jpeg

 

TBH I haven’t spent a lot of time on this as it’s going to be redone at a later date because I want to cut the canopy and make it sliding. But it will do for now.

 

 

 

Edited by Ron Gray
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